In theory this mod should reduce the gain, so maybe something else is wrong.Bieworm wrote: ↑Tue 04/07/20 11:31 pmZP... then there's still the OD from zero on the vol dial. I don't think that this mod's a solution.
Don't shoot, but I don't need heavy distortion anyway. I never use it and if I do there are good pedal on my board to move in that direction. I am satisfied when I have a light amount of drive at 3-4 on the vol dial. I aim for the breakup point on that setting. Now maybe...just maybe... an adjustable NFB loop would bring solace? If it could act like my classic 18W, but with TMB tone abilities. Wouldn't it be possible? And as an extra I have no need for the ruby mod, since the OD will never get into that area?
Any info on the values of caps, resistors and pot?
How about the JA TMB version 2.0 ?
NFB is not the answer. It will kill the tone of the amp, and reduce the touch sensitivity.
Another option you have is to lower the second resistor (the one to ground) from the 470K/470K attenuator. You could try 330K or 220K and see what kind of results you get. If this reduces the gain, but you also feel you're lacking some of the highs, then do ZP's suggestion. Add a 100pF cap across the 470K series resistor.
You definitely need the Ruby Mod. I heard it in your demos. Installing the Ruby Mod could very well improve the way the amp works for you, and improve the distortion sound. Don't give up on it because it's hard for you to source (which it shouldn't be - you were looking at too high a wattage). Find a 1 watt 15V Zener diode. 16V or 14V would be fine too.